Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade3d5a49686d1e7…

MALICIOUS

PDF

100.4 KB Created: 2021-07-15 12:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66438ea81de23ce14ba941eb50d2d7a0 SHA-1: 7e54d5b5f46b1ddc1b6eac04dfc64662e2bfb8ee SHA-256: ade3d5a49686d1e75d663b5042ec902af24a47fa5144034a9d94c0df9265703e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings strongly suggest a malicious intent to lure users to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/18tb5ak2c2lihtddtl3b5r0cq2/59838427689.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p8m21jg2d6k1e64l290fvojm64/tovigoverulanodixux.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160904ae70d20c---lenubogabinujakobawiv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9def8527b---89114434959.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/92169998875.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160813afd45bb2---zumatokuxosujaj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2369c4640345bd646c57f824625e3bd0/90026872256.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5edcf12a9---jawofujadunotawitij.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7dcj8nmdpbs8mgl4jsg6h7pj8h/xekivemijodudenupulowis.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/13fc0a90ad8d1df40d16cedea0ee41c9/pilumer.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d15d626e---28808705056.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/15039719549.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/soguvexelofizijokisalamev.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc24aea856---xefekolu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60DA394EC4798.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e0c97300---75111288285.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/1277394623.pdfIn PDF document text
    • http://zuche0551.com/upload/file/54379040278.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905962ea240---23583235302.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e58208782---55373207956.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/loveso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+do+bees+like+to+eatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 17280 bytes
SHA-256: 77229b674c9d5e0da25d967e37d288fba70b050f9901b7839c8ebf3ed41615a0
font_01_sfnt_off000154ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EA 10368 bytes
SHA-256: 290d28303e9dc1e984e5465f0987f0d986a896009fc22d7c2b32930d025dd3d0
font_02_sfnt_off00016c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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